Oil Pump With Dual Scavenging For a Twin Cam Engine

ABSTRACT

The present invention is an oil pump used in combination with a twin cam type engine, such as a Harley Davidson type A or type B engine, that includes a first high pressure georotor and cam chest scavenger georotor housing, a separator plate that establishes an independent dual scavenging capability and a second crankcase sump scavenger georotor housing that pulls oil from the crankcase sump. The oil pump also includes a high pressure georotor that pulls oil from an oil reservoir and supplies oil under pressure through a stock or aftermarket cam plate to the engine, a cam chest scavenger georotor to scavenge oil in a cam chest of the engine and return the oil to the oil reservoir, a crankcase sump scavenger georotor to scavenge the oil in a crankcase sump of the engine and return the oil to the oil reservoir and an o-ring to prevent the oil from leaking into the cam chest of the engine.

This application claims priority to U.S. Provisional Application 61/301,196 filed on Feb. 3, 2010, the entire disclosure of which is incorporated by reference.

TECHNICAL FIELD & BACKGROUND

The present invention generally relates to an oil pump. More specifically, the invention is an oil pump with dual scavenging for a twin cam engine.

It is an object of the invention to provide an oil pump with dual scavenging for a twin cam engine, with more than one pump returning oil from a sump or oil gathering location to an oil storage area or an area away from the engine.

It is an object of the invention to provide an oil pump with dual scavenging for a twin cam engine, with a design that improves oil control within the engine, which improves engine performance by maintaining a dry sump.

It is an object of the invention to provide an oil pump with dual scavenging for a twin cam engine, with a separate oil passageway from the crankcase to a first suction pump and another separate passageway from the cam chest to a second suction pump.

What is really needed is an oil pump with dual scavenging for a twin cam engine, with more than one pump returning oil from a sump or oil gathering location to the oil storage area or an area away from the engine, with a design that improves oil control within the engine, which improves engine performance by maintaining a dry sump and a separate oil passageway from the crankcase to a first suction pump and another separate passageway from the cam chest to a second suction pump.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will be described by way of exemplary embodiments, but not limitations, illustrated in the accompanying drawings in which like references denote similar elements, and in which:

FIG. 1 illustrates an exploded side perspective view of an oil pump with a dual scavenging feature, in accordance with one embodiment of the present invention.

DETAILED DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS

Various aspects of the illustrative embodiments will be described using terms commonly employed by those skilled in the art to convey the substance of their work to others skilled in the art. However, it will be apparent to those skilled in the art that the present invention may be practiced with only some of the described aspects. For purposes of explanation, specific numbers, materials and configurations are set forth in order to provide a thorough understanding of the illustrative embodiments. However, it will be apparent to one skilled in the art that the present invention may be practiced without the specific details. In other instances, well-known features are omitted or simplified in order not to obscure the illustrative embodiments.

Various operations will be described as multiple discrete operations, in turn, in a manner that is most helpful in understanding the present invention, however, the order of description should not be construed as to imply that these operations are necessarily order dependent. In particular, these operations need not be performed in the order of presentation.

The phrase “in one embodiment” is used repeatedly. The phrase generally does not refer to the same embodiment, however, it may. The terms “comprising”, “having” and “including” are synonymous, unless the context dictates otherwise.

FIG. 1 illustrates an exploded side perspective view of an oil pump with a dual scavenging feature 100, in accordance with one embodiment of the present invention. The oil pump with a dual scavenging feature 100 includes an o-ring 110, a high pressure georotor and cam chest scavenger georotor housing 120, a separator plate 130, a crankcase sump scavenger georotor housing 140, a high pressure georotor 150, a cam chest scavenger georotor 160 and a crankcase sump scavenger georotor 170.

The o-ring 110 provides a seal 120 to prevent oil from leaking into the cam chest of the engine (not shown) when under pressure. The separator plate 130 establishes the completely independent dual scavenging capability of the oil pump 100. Other known oil pump designs all share passageways to a single suction pump and do not provide optimal oil control in the engine. The oil pump with a dual scavenging feature 100 has three georotors, a high pressure georotor 150 for handling high pressure, a cam chest scavenger georotor 160 and a crankcase sump scavenger georotor 170 for scavenging oil located in the cam chest and crankcase sump. The pressure georotor 150 pulls oil from the oil reservoir and supplies the oil under pressure through the stock or aftermarket cam plate to the engine. Oil is returned to the crankcase sump and cam chest, which is then scavenged independently by the cam chest scavenger georotor 160 and a crankcase sump scavenger georotor 170 and is then returned to the oil reservoir.

The oil pump with a dual scavenging feature 100 is designed as a direct replacement for the stock and aftermarket oil pumps for the twin cam type A and type B Harley Davidson engines and other similar twin cam type engines. The oil pump with a dual scavenging feature 100 attaches through any type of suitable fastener in the same manner as other stock and aftermarket oil pumps are attached to the cam plate of the engine. The oil pump with a dual scavenging feature 100 can be used in combination with a Harley Davidson twin cam type A or type B engine, although other types of twin cam engines can be used in combination with the oil pump with a dual scavenging feature 100. The twin cam type A and type B engines are made by a number of different companies and have a similar oil system that benefits from the design of the oil pump with a dual scavenging feature 100 with dual scavenging pumps disposed in the single stock scavenge design (not shown). The oil pump with a dual scavenging feature 100 is designed to fit the stock and aftermarket cam plates that are designed for the twin cam type A and type B engines with no modifications being needed to the engines or cam plates.

Another feature of the oil pump with a dual scavenging feature 100 is employing the use of shadow ports and porting. The shallow porting, on the opposite side of the pressure georotor active porting, is recommended to help balance pressure axially across the georotor 150 and reduce viscous losses. The shadow porting implemented with the oil pump with a dual scavenging feature 100 will have the same porting radii and widths as the active ports. This is not possible with any other oil pump design because of the lack of adequate material thickness to machine the shadow port feature. The oil pump with a dual scavenging feature 100 also has a more robust billet aluminum body for better stability which also results in less chance for distortion.

While the present invention has been related in terms of the foregoing embodiments, those skilled in the art will recognize that the invention is not limited to the embodiments described. The present invention can be practiced with modification and alteration within the spirit and scope of the appended claims. Thus, the description is to be regarded as illustrative instead of restrictive on the present invention. 

1. An oil pump, comprising: a first housing with a top inset and a bottom inset; a separator plate disposed above said first housing that establishes an independent dual scavenging capability of said oil pump; a second housing with a bottom inset disposed above said separator plate; a high pressure georotor disposed below said first housing bottom inset that pulls oil from an oil reservoir and supplies said oil under pressure through a stock or aftermarket cam plate to an engine; a cam chest scavenger georotor disposed in said top inset of first housing below said separator plate to scavenge said oil in a cam chest of said engine and return said oil to said oil reservoir; a crankcase sump scavenger georotor disposed in said second housing bottom inset above said separator plate to scavenge said oil in said crankcase sump of said engine and return said oil to said oil reservoir; and an o-ring disposed beneath said high pressure georotor to prevent said oil from leaking into said cam chest of said engine.
 2. The pump according to claim 1, wherein said first housing is a high pressure georotor and cam chest scavenger georotor housing.
 3. The pump according to claim 1, wherein said second housing is a crankcase sump scavenger georotor housing.
 4. The pump according to claim 1, wherein said oil pump is used in combination with a Harley Davidson twin cam type A or type B engine.
 5. The pump according to claim 1, wherein said oil pump is designed as a replacement stock or aftermarket oil pump to a twin cam type engine.
 6. The pump according to claim 5, wherein said twin cam type engine is a Harley Davidson type A or type B twin cam engine.
 7. The pump according to claim 1, wherein said oil pump employs shadow ports and shadow porting.
 8. The pump according to claim 1, wherein said oil pump has an aluminum body.
 9. The pump according to claim 1, wherein said body is an aluminum billet body.
 10. An oil pump used in combination with a twin cam type engine, comprising: a high pressure georotor and cam chest scavenger georotor first housing with a top inset and a bottom inset; a separator plate disposed above said first housing that establishes an independent dual scavenging capability of said oil pump; a crankcase sump scavenger georotor second housing with a bottom inset disposed above said separator plate; a high pressure georotor disposed below said first housing bottom inset that pulls oil from an oil reservoir and supplies said oil under pressure through a stock or aftermarket cam plate to said engine; a cam chest scavenger georotor disposed in said top inset of first housing below said separator plate to scavenge said oil in a cam chest of said engine and return said oil to said oil reservoir; a crankcase sump scavenger georotor disposed in said second housing bottom inset above said separator plate to scavenge said oil in said crankcase sump of said engine and return said oil to said oil reservoir; and an o-ring disposed beneath said high pressure georotor to prevent said oil from leaking into said cam chest of said engine.
 11. The pump according to claim 10, wherein said twin cam engine is a Harley Davidson twin cam type A or type B engine.
 12. The pump according to claim 10, wherein said oil pump is designed as a replacement stock or aftermarket oil pump to a Harley Davidson type A or type B twin cam type engine.
 13. The pump according to claim 10, wherein said oil pump employs shadow ports and shadow porting.
 14. The pump according to claim 10, wherein said oil pump has an aluminum body.
 15. The pump according to claim 14, wherein said body is an aluminum billet body.
 16. An oil pump used in combination with a Harley Davidson type A or type B twin cam type engine, comprising: a high pressure georotor and cam chest scavenger georotor first housing with a top inset and a bottom inset; a separator plate disposed above said first housing that establishes an independent dual scavenging capability of said oil pump; a crankcase sump scavenger georotor second housing with a bottom inset disposed above said separator plate; a high pressure georotor disposed below said bottom inset first housing that pulls oil from an oil reservoir and supplies said oil under pressure through a stock or aftermarket cam plate to said engine; a cam chest scavenger georotor disposed in said top inset of first housing below said separator plate to scavenge said oil in a cam chest of said engine and return said oil to said oil reservoir; a crankcase sump scavenger georotor disposed in said second housing bottom inset above said separator plate to scavenge said oil in said crankcase sump of said engine and return said oil to said oil reservoir; and an o-ring disposed beneath said high pressure georotor to prevent said oil from leaking into said cam chest of said engine.
 17. The pump according to claim 16, wherein said oil pump is designed as a replacement stock or aftermarket oil pump to a Harley Davidson type A or type B twin cam type engine.
 18. The pump according to claim 16, wherein said oil pump employs shadow ports and shadow porting.
 19. The pump according to claim 16, wherein said oil pump has an aluminum body.
 20. The pump according to claim 19, wherein sad body is an aluminum billet body. 